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Alusil as a hypereutectic aluminium-silicon alloy (AlSi17Cu4Mg) contains approximately 70% aluminium and 30% silicon.[1][2] This alloy was created in 1927 by Schweizer & Fehrenbach[3] of Baden-Baden Germany and further developed by Kolbenschmidt.[2]

The Alusil aluminium alloy is commonly used to make linerless aluminium alloy engine blocks.[4] Alusil, when etched, will expose a very hard silicon precipitate. The silicon surface is porous enough to hold oil, and is an excellent bearing surface. BMW switched from Nikasil-coated cylinder walls to Alusil in 1996 to eliminate the corrosion problems caused through the use of petrol/gasoline containing sulfur.

Below credit to Wiki:Alusil as a hypereutecticaluminium-siliconalloy (Al17Si4CuMg or A390) contains approximately 78% aluminium and 17% silicon.[1][2] This alloy was created in 1927 by Schweizer & Fehrenbach[3] of Baden-Baden Germany and further developed by Kolbenschmidt.[2]

17% silicon content is a whale of a lot different than 30% silicon.
The 30% content in Capt. Kidd's post is in error.

Below credit to Wiki:Alusil as a hypereutecticaluminium-siliconalloy (Al17Si4CuMg or A390) contains approximately 78% aluminium and 17% silicon.[1][2] This alloy was created in 1927 by Schweizer & Fehrenbach[3] of Baden-Baden Germany and further developed by Kolbenschmidt.[2]

17% silicon content is a whale of a lot different than 30% silicon.
The 30% content in Capt. Kidd's post is in error.

I use 4943. It flows real nice.....welded up a 6061-tc angle frame the other day.....I still use 4043 for all cast repairs though...Dave

From all that I can see... 4943 offers superior performance to 4043 in welding cast as well..

what is the reasoning in using 4043 for that purpose if you have 4943 on hand..??

The merits of 4943 on TIG welding cast aluminum as opposed to other alloys like 4043 was the reason for starting this thread in the first place...and all points pro and con.. so if you could elaborate why... am sure many of us would like to hear..

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